CN103529188B - A kind of coal and gas prominent permeation instability test device - Google Patents
A kind of coal and gas prominent permeation instability test device Download PDFInfo
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- CN103529188B CN103529188B CN201310491338.7A CN201310491338A CN103529188B CN 103529188 B CN103529188 B CN 103529188B CN 201310491338 A CN201310491338 A CN 201310491338A CN 103529188 B CN103529188 B CN 103529188B
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Abstract
The present invention relates to coal mine underground exploitation Coal and Gas Outbursts Prediction and prevention and control field, particularly relate to a kind of coal and gas prominent permeation instability test device, this test unit comprises a combination coal sampling mill, combination coal sampling mill is formed by connecting by multiple single-unit coal sampling mill, single-unit coal sampling mill is made up of weldless steel tube, the outer wall of each single-unit coal sampling mill is equipped with breather cheek valve and air pressure measuring apparatus, and each breather cheek valve is all connected with air injection pipe; All coal sample is housed in each single-unit coal sampling mill inner chamber, coal sample is by the compacting of coal sample compaction apparatus, and the single-unit coal sampling mill that compacting coal sample is housed forms combination coal sampling mill through Flange joint together; Described combination coal sampling mill is equipped with air release on the outer end cap near exposed coal analogue means one end.Combination coal sampling mill of the present invention adopts more piece assembly form, can ensure that coal sample has identical compactness, and ensure that coal sample has enough length to realize the observation of barometric gradient; The barometric gradient of the forward and backward coal sample of exposed coal can be adjusted by air injection pipe, air release and sand gravel layer.
Description
[technical field]
The present invention relates to coal mine underground exploitation Coal and Gas Outbursts Prediction and prevention and control field, particularly relate to a kind of coal and gas prominent permeation instability test device.
[background technology]
Coal and gas prominent is one of main mine disaster.
Due to the complicacy of coal and gas prominent mechanism, both at home and abroad the research of coal and gas prominent mechanism is still being continued in exploration.One of hypothesis of coal and gas prominent mechanism " seepage failure mechanism hypothesis ", it is emphasised that coal-bed gas pressure gradient is to the effect of regularity of coal seam.But on the impact of Intensity of coal-gas burst how coal-bed gas pressure gradient, needs to check by testing.At present, the test unit of special coal and gas prominent seepage failure is lacked.
Chinese patent ZL200810021141.6 discloses a kind of analog system for coal seam mash gas dynamic action, include gas injection system, dress sample system, debulking systems and information acquisition system, dress sample system, include the high pressure cylinder body arranging much information sensor, described high pressure cylinder body one end is provided with unloads air valve, and the other end is sealed hydraulic plunger; Have hydraulic fluid chamber in described hydraulic plunger, have the draft tube running through plunger in the middle of hydraulic plunger, described draft tube is through the end cap of hydraulic fluid chamber; Described gas injection system comprises gas cylinder, pressure regulator valve, pipe valve, provides methane gas to draft tube; Described debulking systems includes hydraulic power unit, to the hydraulic fluid chamber oiling in hydraulic plunger, provides oil pressure; The data acquisition of described dress sample, compacting, gas injection process is controlled by information acquisition system.
Chinese patent ZL200910103154.2 discloses a kind of coal and gas prominent combined test apparatus, comprise coal sampling mill, terrestrial stress simulated loading system and air pressure loading equipemtn, described coal sampling mill arranges blowout of coal and gas mouth, blowout of coal and gas mouth arranges valve, also comprise closed container, the pressurized gas passage of described air pressure-loading equipment communicates with closed container inside, terrestrial stress simulated loading system comprises pressurising equipment, be arranged on the Shili Capsule in closed container and charger, the capsule wall of described Shili Capsule is that interlayer is arranged, the pressurizing channel of pressurising equipment communicates with capsule wall interlayer, charger comprises at least two loading blocks, described coal sampling mill is surrounded by least two loading blocks, gap is there is between adjacent load block, described Shili Capsule is enclosed within coal sampling mill outside, described blowout of coal and gas mouth is arranged on closed container outside, described Shili Capsule is the cylindrical of upper and lower opening, and the coal sampling mill surrounded by loading blocks is the cylindrical of upper and lower opening, also comprise pressure acquisition device and video camera, described pressure acquisition device is arranged in coal sampling mill, and the location transparency that coal sampling mill is relative with video camera is arranged.
The major defect that above-mentioned test unit exists is: coal sampling mill only has single-unit, and can only disposable loading coal sample, cause that coal sampling mill coal sample length is shorter and coal sample compacting is uneven, be unfavorable for the observation carrying out methane pressure gradient test, be unfavorable for the research to coal and gas prominent evolution.In addition, there is no airtight simulation tunnel, tunnel background gas pressure change can not be studied on outstanding impact.
[summary of the invention]
For overcoming the deficiencies in the prior art part, the invention provides a kind of coal and gas prominent permeation instability test device, give prominence to research for coal-bed gas and provide a kind of special permeation instability test device, with Obtaining Accurate coal-bed gas pressure gradient to the data of regularity of coal seam.
The technical solution adopted in the present invention is: a kind of coal and gas prominent permeation instability test device, this test unit comprises a combination coal sampling mill, described combination coal sampling mill is formed by connecting by multiple single-unit coal sampling mill, described single-unit coal sampling mill is made up of weldless steel tube, two ends are provided with flange, the outer wall of each described single-unit coal sampling mill is equipped with breather cheek valve and air pressure measuring apparatus, and each described breather cheek valve is all connected with air injection pipe; All coal sample is housed in each described single-unit coal sampling mill inner chamber, coal sample is by the compacting of coal sample compaction apparatus, coal sampling mill is fixed on after coal sample compacting, the single-unit coal sampling mill that compacting coal sample is housed forms combination coal sampling mill by Flange joint together, although the coal sample between each single-unit coal sampling mill exists gap, do not affect the general effect of test from the angle of seepage failure; Described combination coal sampling mill is equipped with air release on the outer end cap near exposed coal analogue means one end; Combination coal sampling mill can ensure that coal sample has enough length to realize the observation of barometric gradient, and ensures that the coal sample of combination coal sampling mill has identical compactness.Air injection pipe is the gas injection of combination coal sampling mill coal sample, and reaches required air pressure.Open the air release of combination coal sampling mill, just can adjust coal sampling mill coal-bed gas pressure gradient before exposed coal.
Further, described coal sample compaction apparatus comprises reaction frame and hydraulic jack, and described hydraulic jack is fixed on the district of test center of described reaction frame, and the oil pipe of described hydraulic jack is connected with oil pump through the outer wall of described single-unit coal sampling mill.Reaction frame is prior art, and mainly comprise floor stringer, reaction beam, distribution beam, add carrier and oil hydraulic system composition, provide counter-force by reaction frame, oil pressure executes lotus, can carry out compacting to the coal sample of coal sampling mill.
Further, described test unit also comprises a combine analog tunnel, described combine analog tunnel is simulated tunnel by multiple single-unit and is formed by connecting, described single-unit simulation tunnel is made up of weldless steel tube, two ends are provided with flange, the outer end cap in combine analog tunnel is provided with air release, and the external flowmeter of described air release is used for measurement gas volume; One end, described combine analog tunnel is connected by connecting pipe with described combination coal sampling mill, and this connecting pipe is provided with ball valve as exposed coal analogue means.Combine analog tunnel can ensure that there is sufficiently long space in simulation tunnel, more tallies with the actual situation.What described exposed coal analogue means adopted is ball valve.Open ball valve and can carry out exposed coal test, for the coal dust amount sprayed in measure analog tunnel and the loose coal dust amount combined in coal sampling mill, evaluate the intensity of Gas Outburst.
Further, have at least one to be provided with grit rock layers in described single-unit simulation tunnel, described grit rock layers is fixed by the filter screen at two ends.Grit rock layers is set in combine analog tunnel, play after exposed coal and extend gas flow length, reach the effect reducing coal sampling mill coal sample gas pressure gradient, shorten the outstanding time continued, reduce intensity of outburst, after the outstanding generation of research, coal sampling mill coal sample barometric gradient changes the impact on prominent development process.
Inventive principle: by coal sample compaction apparatus, compacting is carried out to the coal sample of single-unit coal sampling mill and reach certain compactness.The single-unit coal sampling mill that compacting coal sample is housed is assembled into formation combination coal sampling mill together by flange, makes combination coal sampling mill have certain length.Single-unit is simulated tunnel and be assembled into formation combine analog tunnel together by flange, make combine analog tunnel have certain length.Linked together by connecting pipe between combine analog tunnel and combination coal sampling mill, connecting pipe is equipped with ball valve as exposed coal analogue means.By air injection pipe to the gas injection of combination coal sampling mill coal sample, make coal sampling mill coal sample have certain barometric gradient by the air release venting of coal sampling mill, open exposed coal analogue means when coal sampling mill barometric gradient is certain value, study the Instability gradient in coal seam with this.Combine analog tunnel outer end cap being equipped with gas injection valve, by gas injection valve to simulation tunnel gas injection, for adjusting the background gas pressure in simulation tunnel, also playing the effect of adjustment coal sampling mill coal sample barometric gradient.Grit rock layers is installed in combine analog tunnel.Play after exposed coal and extend gas flow length, reach the effect reducing coal sampling mill coal sample gas pressure gradient, thus shorten the outstanding time continued, reduce intensity of outburst.By adjustment sand gravel layer thickness and sandy gravel particle diameter, outstanding intensity can be adjusted.The evolution that research combination coal sampling mill coal sample is outstanding accordingly.Outstanding intensity is determined by the quality of the loose coal dust amount in outstanding coal dust amount in combine analog tunnel after measurement exposed coal and combination coal sampling mill.
The beneficial effect that the present invention has is: the process of coal and gas prominent when the present invention can simulate stone door punching coal.Combination coal sampling mill adopts more piece assembly form, can ensure that the coal sample combining coal sampling mill has identical compactness, and ensure that coal sample has enough length to realize the observation of barometric gradient, be conducive to observing the process of giving prominence to the development of coal sampling mill deep.By combining the air injection pipe of coal sampling mill, the air injection pipe in air release and combine analog tunnel regulates the barometric gradient of coal sample in the coal sampling mill before exposed coal, and before research exposed coal, coal sampling mill barometric gradient is on outstanding impact; By the barometric gradient of coal sample in coal sampling mill after the sand gravel layer adjustment exposed coal in combine analog tunnel, after research exposed coal, coal sampling mill barometric gradient is on outstanding impact.Outstanding coal powder collection, in simulation tunnel, can realize the mensuration of intensity of outburst.
[accompanying drawing explanation]
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is that the present invention gives prominence to test system architecture principle schematic;
Fig. 2 is coal sample compaction apparatus structural principle schematic diagram of the present invention;
Fig. 3 is reaction frame structural representation of the present invention;
Fig. 4 is reaction frame vertical view of the present invention.
In figure, 1-1. bracket, 1-2. coal sampling mill air injection pipe external tapping (external gas cylinder), 1-3. combines coal sampling mill, 1-4. flange, 1-5. rain glass, 1-6. air injection pipe, 1-7. coupling bolt, 1-8. air release, 1-9. connecting pipe, 1-10. articulation, 1-11. ball valve (exposed coal analogue means), 1-12. sand gravel layer, 1-13. filter screen, 1-14. combine analog tunnel, 1-15. simulates tunnel gas injection valve, 1-16. simulates tunnel air release (external flowmeter), 2-1. hydraulic jack, 2-2. reaction frame, 2-3. single-unit coal sampling mill.
[embodiment]
Below in conjunction with drawings and Examples, the invention will be further described.Fig. 1 is that the present invention gives prominence to test system architecture principle schematic.Fig. 2 is coal sample compaction apparatus principle schematic of the present invention.
See Fig. 1, a kind of coal and gas prominent permeation instability test device, this test unit comprises a combination coal sampling mill, 1-3, combination coal sampling mill 1-3 is formed by connecting by multiple single-unit coal sampling mill 2-3, single-unit coal sampling mill 2-3 is made up of weldless steel tube, two ends are provided with flange 1-4, the outer wall of each single-unit coal sampling mill 2-3 is equipped with breather cheek valve and rain glass 1-5, the external air release 1-8 of combination coal sample 1-3, each breather cheek valve is all connected with air injection pipe 1-6, all coal sample is housed in each single-unit coal sampling mill 2-3, coal sample in each single-unit coal sampling mill 2-3 is after special coal sample compaction apparatus respectively compacting (as shown in Figure 2), combined by flange 1-4 and coupling bolt 1-7, form the combination coal sampling mill 1-3 of certain length.
Further, described coal sample compaction apparatus comprises reaction frame 2-2 and hydraulic jack 2-1, and hydraulic jack 2-1 is fixed on the district of test center of reaction frame 2-2, and the oil pipe of hydraulic jack 2-1 is connected with oil pump through the outer wall of single-unit coal sampling mill 2-3.Reaction frame 2-2 adopts existing product (as shown in Figure 3,4), mainly comprise floor stringer, reaction beam, distribution beam, add carrier and oil hydraulic system composition, counter-force is provided by reaction frame, oil hydraulic system executes lotus, apply certain pressure by hydraulic jack 2-1 to the coal sample in single-unit coal sampling mill 2-3, ensure that coal sample has certain compactness.
Combination coal sampling mill 1-3 adopts more piece assembly form, can ensure that the coal sample combining coal sampling mill has identical compactness, and ensure that coal sample has enough length to realize the observation of barometric gradient, be conducive to observing the process of giving prominence to the development of coal sampling mill deep.By the barometric gradient of coal sample in coal sampling mill before air injection pipe 1-6, the air release 1-8 adjustment exposed coal of combination coal sampling mill 1-3, before being conducive to studying exposed coal, coal sampling mill barometric gradient is on outstanding impact.
Further, test unit also comprises a combine analog tunnel 1-14, combine analog tunnel is simulated tunnel by multiple single-unit and is formed by connecting, single-unit simulation tunnel is made up of weldless steel tube, two ends are provided with flange, single-unit simulation tunnel is combined by flange 1-4 and coupling bolt 1-7 and is formed combine analog tunnel 1-14, combination coal sampling mill 1-3 is connected with articulation 1-10 by connecting pipe 1-9 with combine analog tunnel 1-14, connecting pipe 1-9 is equipped with ball valve 1-11 as exposed coal analogue means, before exposed coal, ball valve 1-11 is in closed condition.
Single-unit simulation has at least one to be provided with grit rock layers 1-12 in tunnel, grit rock layers 1-12 is fixed by the filter screen 1-13 at two ends, after exposed coal, sand gravel layer 1-12 plays the effect extending gas flow length, the barometric gradient of coal sample in combination coal sampling mill 1-3 is reduced, shorten the outstanding termination time, reduce intensity of outburst.
By the barometric gradient of coal sample in coal sampling mill before air injection pipe 1-6, air release 1-8 and simulation tunnel gas injection valve 1-15 adjustment exposed coal, by the sand gravel layer 1-12 in combine analog tunnel, the barometric gradient of coal sample in coal sampling mill after adjustment exposed coal, after can disclosing exposed coal further, coal sampling mill barometric gradient is on outstanding impact.Outstanding coal powder collection, in simulation tunnel 1-14, can realize the mensuration of intensity of outburst.
The using method of this test unit is as follows: air injection pipe 1-6 is by the external gas cylinder of coal sampling mill air injection pipe external tapping 1-2, by external gas cylinder to the coal sample gas injection in combination coal sampling mill 1-3, combination coal sampling mill 1-3 and combine analog tunnel are provided with the air pressure in rain glass 1-5 testing experiment process.Combine analog tunnel end cap is equipped with simulation tunnel gas injection valve 1-15 for adjusting the air pressure background value before exposed coal in combine analog tunnel, combination coal sampling mill 1-3 is equipped with air release 1-8 on the outer end cap of exposed coal analogue means 1-11 one end, by simulation tunnel gas injection valve 1-15 to the 1-14 gas injection of combine analog tunnel, and open air release 1-8 and exit, the coal sample in combination coal sampling mill 1-3 is made to reach certain gas pressure gradient, when the pressure gradient combining coal sample in coal sampling mill 1-3 is certain value, open ball valve 1-11 and carry out exposed coal test, by the coal dust amount sprayed in the 1-14 of measure analog tunnel and the loose coal dust amount combined in coal sampling mill 1-3, carry out the analysis of intensity of outburst.The external flowmeter survey gas volume of combine analog tunnel air release 1-16.Above-mentioned each parts are installed on bracket 1-1.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.
Claims (5)
1. a coal and gas prominent permeation instability test device, it is characterized in that: this test unit comprises a combination coal sampling mill, described combination coal sampling mill is formed by connecting by multiple single-unit coal sampling mill, described single-unit coal sampling mill is made up of weldless steel tube, two ends are provided with flange, the outer wall of each described single-unit coal sampling mill is equipped with breather cheek valve and air pressure measuring apparatus, and each described breather cheek valve is all connected with air injection pipe; All coal sample is housed in each described single-unit coal sampling mill inner chamber, coal sample is by being fixed in coal sampling mill after the compacting of coal sample compaction apparatus, and the single-unit coal sampling mill that compacting coal sample is housed forms combination coal sampling mill by Flange joint together; In described combination coal sampling mill, outermost single-unit coal sampling mill is equipped with one by extraneous short tube, this short tube is equipped with exposed coal analogue means, the outer end cap of this single-unit coal sampling mill is equipped with air release.
2. a kind of coal and gas prominent permeation instability test device according to claim 1, is characterized in that: described exposed coal analogue means is ball valve.
3. a kind of coal and gas prominent permeation instability test device according to claim 1, it is characterized in that: described coal sample compaction apparatus comprises reaction frame and hydraulic jack, described hydraulic jack is fixed on the district of test center of described reaction frame, and the oil pipe of described hydraulic jack is connected with oil pump through the outer wall of described single-unit coal sampling mill.
4. a kind of coal and gas prominent permeation instability test device according to any one of claim 1-3, it is characterized in that: described test unit also comprises a combine analog tunnel, described combine analog tunnel is simulated tunnel by multiple single-unit and is formed by connecting, described single-unit simulation tunnel is made up of weldless steel tube, two ends are provided with flange, the outer end cap in described combine analog tunnel is provided with air release, and the external flowmeter of described air release is used for measurement gas volume; One end, described combine analog tunnel and described combination coal sampling mill are connected by a connecting pipe with exposed coal analogue means.
5. a kind of coal and gas prominent permeation instability test device according to claim 4, is characterized in that: has at least one to be provided with grit rock layers in described single-unit simulation tunnel, described grit rock layers is fixed by the filter screen at two ends.
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| CN107356723B (en) * | 2017-06-26 | 2019-06-07 | 重庆大学 | Mine laneway systems modelling component |
| CN107389859B (en) * | 2017-06-26 | 2019-06-21 | 重庆大学 | People-machine-ring is damaged simulation experiment method in coal and gas prominent Catastrophe Process |
| CN107389678B (en) * | 2017-06-26 | 2020-03-24 | 重庆大学 | Visual physical simulation test method for coal and gas outburst dynamic disaster |
| CN111272545A (en) * | 2018-12-05 | 2020-06-12 | 田成林 | Mine composite disaster simulation test system and method considering roof influence |
| CN110261220A (en) * | 2018-12-05 | 2019-09-20 | 田成林 | A kind of compound dynamic disaster simulation experiment method of mine for considering top plate and influencing |
| CN111487163B (en) * | 2020-04-21 | 2022-11-29 | 重庆大学 | Novel variable-load pressurizing grouting test device for fractured coal and rock mass |
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